Update miniaudio to v0.11.12

[a740g]

This PR updates miniaudio to v0.11.12. Changes are as follows:

• Fix a bug with data source ranges which resulted in data being read from outside the range.
• Fix a crash due to a race condition in the resource manager.
• Fix a crash with some backends when rerouting the playback side of a duplex device.
• Fix some bugs with initialization of POSIX threads.
• Fix a bug where sounds are not resampled when MA_SOUND_NO_PITCH is used.
• Fix a bug where changing the range of a data source would result in no audio being read.
• Fix a bug where asynchronously loaded data sources via the resources manager would reset ranges and loop points.
• Fix some Wimplicit-fallthrough warnings.
• Add support for Windows 95/98.
• Add support for configuring the stack size of resource manager job threads.
• Add support for callback notifications when a sound reaches the end.
• Optimizations to the high level API.
• Remove the old runtime linking system for pthread. The MA_USE_RUNTIME_LINKING_FOR_PTHREAD option is no longer used.
• WASAPI: Fix a crash when starting a device while it's in the process of rerouting.
• Windows: Remove the Windows-specific default memcpy(), malloc(), etc.